How do I create my own captcha and verify it in asp.net using c#?

Question

How do I create my own captcha and test that response is generated by a person? is it possible to do it in asp.net?

Answer 1

You could create your own images of numbers/words from paint by doodling and store the file location and corresponding string in the database. You could later randomly pick an entry, show the image and then verify it with the string value column.

Or you could use external service like http://www.google.com/recaptcha/captcha

Answer 2

You can use reCAPTCHA with ASP.NET.

Sign up for a free app key here, download the library and follow the quick start.